Reasons not to trust the Visual Editor.
Below is a script that creates a button:
All I did was paste the code into the Text Editor.
But when I switch to the Visual Editor:
<script>// <![CDATA[
function goBack() { window.history.back() }
// ]]></script>
<button onclick=”goBack()”>Go Back</button>
Aha, now you see the code I pasted in to create the button. The Visual Editor has kindly encoded the angle brackets so that the code no longer works.
Also, I just cleaned up some posts and pages from a Visual Editor fan. There were a bunch of empty heading tags in amongst the content. Another big no-no. WordPress uses the H1 tag for your site name and the H2 tag for your Post or Page title. It isn’t just about fonts!
